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x86/static_call: Add inline static call implementation for x86-64

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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
This commit is contained in:
Josh Poimboeuf
2020-08-18 15:57:45 +02:00
committed by Ingo Molnar
parent e6d6c071f2
commit 1e7e478838
13 changed files with 193 additions and 9 deletions
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1
tools/objtool/check.h
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@@ -22,6 +22,7 @@ struct insn_state {
struct instruction {
struct list_head list;
struct hlist_node hash;
struct list_head static_call_node;
struct section *sec;
unsigned long offset;
unsigned int len;