diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-11-07 14:12:33 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-11-07 15:04:49 +0000 |
| commit | f1ba46ee787d0a880f884f401031315b0a777f25 (patch) | |
| tree | 10919416848d1b6313dc4a2d9f050f90bd8ce989 /arch | |
| parent | 80708677fab44a1489a089e162455dfb4dd722cd (diff) | |
| download | linux-f1ba46ee787d0a880f884f401031315b0a777f25.tar.bz2 | |
arm64: ftrace: eliminate literal pool entries
Replace ldr xN, =<symbol> with adrp/add or adrp/ldr [as appropriate]
in the implementation of _mcount(), which may be called very often.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/entry-ftrace.S | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/arm64/kernel/entry-ftrace.S b/arch/arm64/kernel/entry-ftrace.S index 38e704e597f7..08cafc518b9a 100644 --- a/arch/arm64/kernel/entry-ftrace.S +++ b/arch/arm64/kernel/entry-ftrace.S @@ -98,8 +98,8 @@ ENTRY(_mcount) mcount_enter - ldr x0, =ftrace_trace_function - ldr x2, [x0] + adrp x0, ftrace_trace_function + ldr x2, [x0, #:lo12:ftrace_trace_function] adr x0, ftrace_stub cmp x0, x2 // if (ftrace_trace_function b.eq skip_ftrace_call // != ftrace_stub) { @@ -115,14 +115,15 @@ skip_ftrace_call: // return; mcount_exit // return; // } skip_ftrace_call: - ldr x1, =ftrace_graph_return - ldr x2, [x1] // if ((ftrace_graph_return - cmp x0, x2 // != ftrace_stub) - b.ne ftrace_graph_caller - - ldr x1, =ftrace_graph_entry // || (ftrace_graph_entry - ldr x2, [x1] // != ftrace_graph_entry_stub)) - ldr x0, =ftrace_graph_entry_stub + adrp x1, ftrace_graph_return + ldr x2, [x1, #:lo12:ftrace_graph_return] + cmp x0, x2 // if ((ftrace_graph_return + b.ne ftrace_graph_caller // != ftrace_stub) + + adrp x1, ftrace_graph_entry // || (ftrace_graph_entry + adrp x0, ftrace_graph_entry_stub // != ftrace_graph_entry_stub)) + ldr x2, [x1, #:lo12:ftrace_graph_entry] + add x0, x0, #:lo12:ftrace_graph_entry_stub cmp x0, x2 b.ne ftrace_graph_caller // ftrace_graph_caller(); |