Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/gi…

…t/mmarek/kbuild Pull kbuild updates from Michal Marek: - EXPORT_SYMBOL for asm source by Al Viro. This does bring a regression, because genksyms no longer generates checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is working on a patch to fix this. Plus, we are talking about functions like strcpy(), which rarely change prototypes. - Fixes for PPC fallout of the above by Stephen Rothwell and Nick Piggin - fixdep speedup by Alexey Dobriyan. - preparatory work by Nick Piggin to allow architectures to build with -ffunction-sections, -fdata-sections and --gc-sections - CONFIG_THIN_ARCHIVES support by Stephen Rothwell - fix for filenames with colons in the initramfs source by me. * 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (22 commits) initramfs: Escape colons in depfile ppc: there is no clear_pages to export powerpc/64: whitelist unresolved modversions CRCs kbuild: -ffunction-sections fix for archs with conflicting sections kbuild: add arch specific post-link Makefile kbuild: allow archs to select link dead code/data elimination kbuild: allow architectures to use thin archives instead of ld -r kbuild: Regenerate genksyms lexer kbuild: genksyms fix for typeof handling fixdep: faster CONFIG_ search ia64: move exports to definitions sparc32: debride memcpy.S a bit [sparc] unify 32bit and 64bit string.h sparc: move exports to definitions ppc: move exports to definitions arm: move exports to definitions s390: move exports to definitions m68k: move exports to definitions alpha: move exports to actual definitions x86: move exports to actual definitions ...
kyagi · Oct 14, 2016 · 84d6984 · 84d6984
2 parents d4d24d2 + 590abbd
commit 84d6984
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diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
@@ -41,6 +41,7 @@ This document describes the Linux kernel Makefiles.
 	   --- 6.8 Custom kbuild commands
 	   --- 6.9 Preprocessing linker scripts
 	   --- 6.10 Generic header files
+	   --- 6.11 Post-link pass
 
 	=== 7 Kbuild syntax for exported headers
 		--- 7.1 header-y
@@ -1237,6 +1238,21 @@ When kbuild executes, the following steps are followed (roughly):
 	to list the file in the Kbuild file.
 	See "7.4 generic-y" for further info on syntax etc.
 
+--- 6.11 Post-link pass
+
+	If the file arch/xxx/Makefile.postlink exists, this makefile
+	will be invoked for post-link objects (vmlinux and modules.ko)
+	for architectures to run post-link passes on. Must also handle
+	the clean target.
+
+	This pass runs after kallsyms generation. If the architecture
+	needs to modify symbol locations, rather than manipulate the
+	kallsyms, it may be easier to add another postlink target for
+	.tmp_vmlinux? targets to be called from link-vmlinux.sh.
+
+	For example, powerpc uses this to check relocation sanity of
+	the linked vmlinux file.
+
 === 7 Kbuild syntax for exported headers
 
 The kernel includes a set of headers that is exported to userspace.

diff --git a/Makefile b/Makefile
@@ -623,6 +623,11 @@ KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
 KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
 KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
 
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
+KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
+endif
+
 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
 KBUILD_CFLAGS	+= -Os
 else
@@ -803,6 +808,10 @@ LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
 
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
+endif
+
 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
 LDFLAGS_vmlinux	+= $(call ld-option, -X,)
 endif
@@ -942,9 +951,12 @@ endif
 include/generated/autoksyms.h: FORCE
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
 
-# Final link of vmlinux
-      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
-quiet_cmd_link-vmlinux = LINK    $@
+ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
+
+# Final link of vmlinux with optional arch pass after final link
+    cmd_link-vmlinux =                                                 \
+	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;       \
+	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
 	+$(call if_changed,link-vmlinux)
@@ -1271,6 +1283,7 @@ $(clean-dirs):
 
 vmlinuxclean:
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
+	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
 
 clean: archclean vmlinuxclean
 

diff --git a/arch/Kconfig b/arch/Kconfig
@@ -450,6 +450,27 @@ config CC_STACKPROTECTOR_STRONG
 
 endchoice
 
+config THIN_ARCHIVES
+	bool
+	help
+	  Select this if the architecture wants to use thin archives
+	  instead of ld -r to create the built-in.o files.
+
+config LD_DEAD_CODE_DATA_ELIMINATION
+	bool
+	help
+	  Select this if the architecture wants to do dead code and
+	  data elimination with the linker by compiling with
+	  -ffunction-sections -fdata-sections and linking with
+	  --gc-sections.
+
+	  This requires that the arch annotates or otherwise protects
+	  its external entry points from being discarded. Linker scripts
+	  must also merge .text.*, .data.*, and .bss.* correctly into
+	  output sections. Care must be taken not to pull in unrelated
+	  sections (e.g., '.text.init'). Typically '.' in section names
+	  is used to distinguish them from label names / C identifiers.
+
 config HAVE_ARCH_WITHIN_STACK_FRAMES
 	bool
 	help

diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild
@@ -3,6 +3,7 @@
 generic-y += clkdev.h
 generic-y += cputime.h
 generic-y += exec.h
+generic-y += export.h
 generic-y += irq_work.h
 generic-y += mcs_spinlock.h
 generic-y += mm-arch-hooks.h

diff --git a/arch/alpha/kernel/Makefile b/arch/alpha/kernel/Makefile
@@ -8,7 +8,7 @@ ccflags-y	:= -Wno-sign-compare
 
 obj-y    := entry.o traps.o process.o osf_sys.o irq.o \
 	    irq_alpha.o signal.o setup.o ptrace.o time.o \
-	    alpha_ksyms.o systbls.o err_common.o io.o
+	    systbls.o err_common.o io.o
 
 obj-$(CONFIG_VGA_HOSE)	+= console.o
 obj-$(CONFIG_SMP)	+= smp.o

diff --git a/arch/alpha/kernel/alpha_ksyms.c b/arch/alpha/kernel/alpha_ksyms.c
diff --git a/arch/alpha/kernel/machvec_impl.h b/arch/alpha/kernel/machvec_impl.h
@@ -144,9 +144,11 @@
    else beforehand.  Fine.  We'll do it ourselves.  */
 #if 0
 #define ALIAS_MV(system) \
-  struct alpha_machine_vector alpha_mv __attribute__((alias(#system "_mv")));
+  struct alpha_machine_vector alpha_mv __attribute__((alias(#system "_mv"))); \
+  EXPORT_SYMBOL(alpha_mv);
 #else
 #define ALIAS_MV(system) \
-  asm(".global alpha_mv\nalpha_mv = " #system "_mv");
+  asm(".global alpha_mv\nalpha_mv = " #system "_mv"); \
+  EXPORT_SYMBOL(alpha_mv);
 #endif
 #endif /* GENERIC */
diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
@@ -115,6 +115,7 @@ unsigned long alpha_agpgart_size = DEFAULT_AGP_APER_SIZE;
 
 #ifdef CONFIG_ALPHA_GENERIC
 struct alpha_machine_vector alpha_mv;
+EXPORT_SYMBOL(alpha_mv);
 #endif
 
 #ifndef alpha_using_srm

diff --git a/arch/alpha/lib/callback_srm.S b/arch/alpha/lib/callback_srm.S
@@ -3,6 +3,7 @@
  */
 
 #include <asm/console.h>
+#include <asm/export.h>
 
 .text
 #define HWRPB_CRB_OFFSET 0xc0
@@ -92,6 +93,10 @@ CALLBACK(reset_env, CCB_RESET_ENV, 4)
 CALLBACK(save_env, CCB_SAVE_ENV, 1)
 CALLBACK(pswitch, CCB_PSWITCH, 3)
 CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
+
+EXPORT_SYMBOL(callback_getenv)
+EXPORT_SYMBOL(callback_setenv)
+EXPORT_SYMBOL(callback_save_env)
 
 .data
 __alpha_using_srm:		# For use by bootpheader

diff --git a/arch/alpha/lib/checksum.c b/arch/alpha/lib/checksum.c
@@ -48,6 +48,7 @@ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 		(__force u64)saddr + (__force u64)daddr +
 		(__force u64)sum + ((len + proto) << 8));
 }
+EXPORT_SYMBOL(csum_tcpudp_magic);
 
 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 			  __u32 len, __u8 proto, __wsum sum)
@@ -144,6 +145,7 @@ __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 {
 	return (__force __sum16)~do_csum(iph,ihl*4);
 }
+EXPORT_SYMBOL(ip_fast_csum);
 
 /*
  * computes the checksum of a memory block at buff, length len,
@@ -178,3 +180,4 @@ __sum16 ip_compute_csum(const void *buff, int len)
 {
 	return (__force __sum16)~from64to16(do_csum(buff,len));
 }
+EXPORT_SYMBOL(ip_compute_csum);
diff --git a/arch/alpha/lib/clear_page.S b/arch/alpha/lib/clear_page.S
@@ -3,7 +3,7 @@
  *
  * Zero an entire page.
  */
-
+#include <asm/export.h>
 	.text
 	.align 4
 	.global clear_page
@@ -37,3 +37,4 @@ clear_page:
 	nop
 
 	.end clear_page
+	EXPORT_SYMBOL(clear_page)
diff --git a/arch/alpha/lib/clear_user.S b/arch/alpha/lib/clear_user.S
@@ -24,6 +24,7 @@
  * Clobbers:
  *	$1,$2,$3,$4,$5,$6
  */
+#include <asm/export.h>
 
 /* Allow an exception for an insn; exit if we get one.  */
 #define EX(x,y...)			\
@@ -111,3 +112,4 @@ $exception:
 	ret	$31, ($28), 1	# .. e1 :
 
 	.end __do_clear_user
+	EXPORT_SYMBOL(__do_clear_user)
diff --git a/arch/alpha/lib/copy_page.S b/arch/alpha/lib/copy_page.S
@@ -3,7 +3,7 @@
  *
  * Copy an entire page.
  */
-
+#include <asm/export.h>
 	.text
 	.align 4
 	.global copy_page
@@ -47,3 +47,4 @@ copy_page:
 	nop
 
 	.end copy_page
+	EXPORT_SYMBOL(copy_page)
diff --git a/arch/alpha/lib/copy_user.S b/arch/alpha/lib/copy_user.S
@@ -26,6 +26,8 @@
  *	$1,$2,$3,$4,$5,$6,$7
  */
 
+#include <asm/export.h>
+
 /* Allow an exception for an insn; exit if we get one.  */
 #define EXI(x,y...)			\
 	99: x,##y;			\
@@ -143,3 +145,4 @@ $101:
 	ret $31,($28),1
 
 	.end __copy_user
+EXPORT_SYMBOL(__copy_user)
diff --git a/arch/alpha/lib/csum_ipv6_magic.S b/arch/alpha/lib/csum_ipv6_magic.S
@@ -12,6 +12,7 @@
  * added by Ivan Kokshaysky <[email protected]>
  */
 
+#include <asm/export.h>
 	.globl csum_ipv6_magic
 	.align 4
 	.ent csum_ipv6_magic
@@ -113,3 +114,4 @@ csum_ipv6_magic:
 	ret			# .. e1 :
 
 	.end csum_ipv6_magic
+	EXPORT_SYMBOL(csum_ipv6_magic)
diff --git a/arch/alpha/lib/csum_partial_copy.c b/arch/alpha/lib/csum_partial_copy.c
@@ -374,6 +374,7 @@ csum_partial_copy_from_user(const void __user *src, void *dst, int len,
 	}
 	return (__force __wsum)checksum;
 }
+EXPORT_SYMBOL(csum_partial_copy_from_user);
 
 __wsum
 csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
@@ -386,3 +387,4 @@ csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
 	set_fs(oldfs);
 	return checksum;
 }
+EXPORT_SYMBOL(csum_partial_copy_nocheck);
diff --git a/arch/alpha/lib/dec_and_lock.c b/arch/alpha/lib/dec_and_lock.c
@@ -7,6 +7,7 @@
 
 #include <linux/spinlock.h>
 #include <linux/atomic.h>
+#include <linux/export.h>
 
   asm (".text					\n\
 	.global _atomic_dec_and_lock		\n\
@@ -39,3 +40,4 @@ static int __used atomic_dec_and_lock_1(atomic_t *atomic, spinlock_t *lock)
 	spin_unlock(lock);
 	return 0;
 }
+EXPORT_SYMBOL(_atomic_dec_and_lock);