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- Prevent clang from reordering the reachable annotation in an inline asm statement

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without inputs
 
 - Fix objtool builds on non-glibc systems due to undefined __always_inline
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Merge tag 'objtool_urgent_for_v5.16_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull objtool fixes from Borislav Petkov:

 - Prevent clang from reordering the reachable annotation in
   an inline asm statement without inputs

 - Fix objtool builds on non-glibc systems due to undefined
   __always_inline

* tag 'objtool_urgent_for_v5.16_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  compiler.h: Fix annotation macro misplacement with Clang
  uapi: Fix undefined __always_inline on non-glibc systems
This commit is contained in:
Linus Torvalds 2021-12-26 10:19:40 -08:00
commit 2afa90bd1c
4 changed files with 6 additions and 4 deletions
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4
include/linux/compiler.h
View File

@ -121,7 +121,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.reachable\n\t" \
".long " __stringify_label(c) "b - .\n\t" \
".popsection\n\t"); \
".popsection\n\t" : : "i" (c)); \
})
#define annotate_reachable() __annotate_reachable(__COUNTER__)
@ -129,7 +129,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
asm volatile(__stringify_label(c) ":\n\t" \
".pushsection .discard.unreachable\n\t" \
".long " __stringify_label(c) "b - .\n\t" \
".popsection\n\t"); \
".popsection\n\t" : : "i" (c)); \
})
#define annotate_unreachable() __annotate_unreachable(__COUNTER__)

4
include/linux/instrumentation.h
View File

@ -11,7 +11,7 @@
asm volatile(__stringify(c) ": nop\n\t" \
".pushsection .discard.instr_begin\n\t" \
".long " __stringify(c) "b - .\n\t" \
".popsection\n\t"); \
".popsection\n\t" : : "i" (c)); \
})
#define instrumentation_begin() __instrumentation_begin(__COUNTER__)
@ -50,7 +50,7 @@
asm volatile(__stringify(c) ": nop\n\t" \
".pushsection .discard.instr_end\n\t" \
".long " __stringify(c) "b - .\n\t" \
".popsection\n\t"); \
".popsection\n\t" : : "i" (c)); \
})
#define instrumentation_end() __instrumentation_end(__COUNTER__)
#else

1
include/uapi/linux/byteorder/big_endian.h
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@ -9,6 +9,7 @@
#define __BIG_ENDIAN_BITFIELD
#endif
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/swab.h>

1
include/uapi/linux/byteorder/little_endian.h
View File

@ -9,6 +9,7 @@
#define __LITTLE_ENDIAN_BITFIELD
#endif
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/swab.h>