diff options
| author |   Josh Poimboeuf <jpoimboe@redhat.com> | 2020-08-18 15:57:45 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2020-09-01 09:58:05 +0200 |
| commit | 1e7e47883830aae5e8246a22ca2fc6883c61acdf (patch) | |
| tree | 225d6e2fc34af21e42996c0434f871486c586a2f /include/asm-generic | |
| parent | x86/static_call: Add out-of-line static call implementation (diff) | |
| download | linux-dev-1e7e47883830aae5e8246a22ca2fc6883c61acdf.tar.xz linux-dev-1e7e47883830aae5e8246a22ca2fc6883c61acdf.zip | |
x86/static_call: Add inline static call implementation for x86-64
Add the inline static call implementation for x86-64. The generated code
is identical to the out-of-line case, except we move the trampoline into
it's own section.
Objtool uses the trampoline naming convention to detect all the call
sites. It then annotates those call sites in the .static_call_sites
section.
During boot (and module init), the call sites are patched to call
directly into the destination function. The temporary trampoline is
then no longer used.
[peterz: merged trampolines, put trampoline in section]
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20200818135804.864271425@infradead.org
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 0088a5cd6a40..0502087654d7 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -642,6 +642,12 @@ *(.softirqentry.text) \ __softirqentry_text_end = .; +#define STATIC_CALL_TEXT \ + ALIGN_FUNCTION(); \ + __static_call_text_start = .; \ + *(.static_call.text) \ + __static_call_text_end = .; + /* Section used for early init (in .S files) */ #define HEAD_TEXT KEEP(*(.head.text)) |