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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2019-07-18 03:36:46 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-07-18 21:01:06 +0200 |
| commit | a7e47f26039c26312a4144c3001b4e9fa886bd45 (patch) | |
| tree | 5cd47870c750d1701946c8d9cbd51448b8b0f1fe /tools/objtool | |
| parent | bpf: Disable GCC -fgcse optimization for ___bpf_prog_run() (diff) | |
| download | linux-a7e47f26039c26312a4144c3001b4e9fa886bd45.tar.xz linux-a7e47f26039c26312a4144c3001b4e9fa886bd45.zip | |
objtool: Add mcsafe_handle_tail() to the uaccess safe list
After an objtool improvement, it's reporting that __memcpy_mcsafe() is
calling mcsafe_handle_tail() with AC=1:
arch/x86/lib/memcpy_64.o: warning: objtool: .fixup+0x13: call to mcsafe_handle_tail() with UACCESS enabled
arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0x34: (alt)
arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0xb: (branch)
arch/x86/lib/memcpy_64.o: warning: objtool: __memcpy_mcsafe()+0x0: <=== (func)
mcsafe_handle_tail() is basically an extension of __memcpy_mcsafe(), so
AC=1 is supposed to be set. Add mcsafe_handle_tail() to the uaccess
safe list.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/035c38f7eac845281d3c3d36749144982e06e58c.1563413318.git.jpoimboe@redhat.com
Diffstat (limited to 'tools/objtool')
| -rw-r--r-- | tools/objtool/check.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 2f8ba0368231..f9494ff8c286 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -490,6 +490,7 @@ static const char *uaccess_safe_builtin[] = { /* misc */ "csum_partial_copy_generic", "__memcpy_mcsafe", + "mcsafe_handle_tail", "ftrace_likely_update", /* CONFIG_TRACE_BRANCH_PROFILING */ NULL }; |