xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

parisc: Fix ftrace function tracer

Browse Source 
Fix the FTRACE function tracer for 32- and 64-bit kernel.
The former code was horribly broken.

Reimplement most coding in assembly and utilize optimizations, e.g. put
mcount() and ftrace_stub() into one L1 cacheline.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2016-04-13 22:27:22 +02:00
parent b562e44f50
commit 366dd4ea9d
8 changed files with 117 additions and 171 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/parisc/kernel/head.S
View File

@@ -129,6 +129,15 @@ $pgt_fill_loop:
/* And the stack pointer too */
ldo THREAD_SZ_ALGN(%r6),%sp
#if defined(CONFIG_64BIT) && defined(CONFIG_FUNCTION_TRACER)
.import _mcount,data
/* initialize mcount FPTR */
/* Get the global data pointer */
loadgp
load32 PA(_mcount), %r10
std %dp,0x18(%r10)
#endif
#ifdef CONFIG_SMP
/* Set the smp rendezvous address into page zero.
** It would be safer to do this in init_smp_config() but