How to use perf tool?
I use diff compare "nm -S vmlinux".
android_x86:/ $ su
android_x86:/ # diff /sdcard/with_vmlinux /sdcard/without_vmlinux
--- /sdcard/with_vmlinux
+++ /sdcard/without_vmlinux
@@ -12951,7 +12951,7 @@
ffffffff81338400 00000000000000dc T compat_only_sysfs_link_entry_to_kobj
ffffffff810884d0 00000000000002b7 T compat_ptrace_request
ffffffff812b4e80 0000000000000025 T compat_ptr_ioctl
-ffffffff811380d0 000000000000008d T compat_put_bitmap
+ffffffff811380d0 000000000000008a T compat_put_bitmap
ffffffff81a62180 000000000000000f t compat_raw_ioctl
ffffffff81afa060 000000000000000f t compat_rawv6_ioctl
ffffffff81090790 0000000000000018 T compat_restore_altstack
@@ -14260,7 +14260,7 @@
ffffffff8167d380 00000000000000dd T cppc_set_enable
ffffffff8167d460 0000000000000221 T cppc_set_perf
ffffffff818cdbe0 000000000000004f t cppc_update_perf
-ffffffff8102bba0 000000000000012b t cp_stat64
+ffffffff8102bba0 000000000000012a t cp_stat64
ffffffff81494810 0000000000000028 t cp_status_show
ffffffff812a33e0 00000000000001b2 t cp_statx
ffffffff82e1c934 0000000000000004 b cpu0_hotpluggable
@@ -26993,7 +26993,6 @@
ffffffff821b8000 0000000000000038 d CSWTCH.102
ffffffff821cd6c0 0000000000000048 d CSWTCH.107
ffffffff821d4b80 0000000000000018 d CSWTCH.11
-ffffffff8203dd88 000000000000000c d CSWTCH.111
ffffffff82152de0 00000000000000a0 d CSWTCH.111
ffffffff82105ea0 0000000000000020 d CSWTCH.1116
ffffffff82105e80 0000000000000020 d CSWTCH.1121
@@ -27002,6 +27001,7 @@
ffffffff821d4b60 0000000000000018 d CSWTCH.12
ffffffff821b2c60 0000000000000024 d CSWTCH.120
ffffffff82033fc0 0000000000000068 d CSWTCH.123
+ffffffff8203dd88 000000000000000c d CSWTCH.123
ffffffff82014b80 00000000000000a0 d CSWTCH.125
ffffffff82014b40 0000000000000028 d CSWTCH.128
ffffffff82033f40 0000000000000064 d CSWTCH.128
@@ -27026,7 +27026,6 @@
ffffffff821c9b80 0000000000000018 d CSWTCH.189
ffffffff821b39a0 0000000000000028 d CSWTCH.19
ffffffff820055c0 0000000000000024 d CSWTCH.195
-ffffffff82208de0 0000000000000004 d CSWTCH.199
ffffffff82146127 0000000000000006 d CSWTCH.2
ffffffff82146380 0000000000000014 d CSWTCH.2
ffffffff8219f770 0000000000000018 d CSWTCH.20
@@ -27033,5 +27032,6 @@
ffffffff821d9c90 0000000000000018 d CSWTCH.20
ffffffff821b7e60 0000000000000128 d CSWTCH.202
+ffffffff82208de0 0000000000000004 d CSWTCH.202
ffffffff821b7cc0 0000000000000188 d CSWTCH.204
ffffffff821b7c80 0000000000000038 d CSWTCH.206
ffffffff821a4ac0 0000000000000006 d CSWTCH.207
@@ -27043,8 +27043,8 @@
ffffffff821b7be0 0000000000000038 d CSWTCH.214
ffffffff821c9940 0000000000000030 d CSWTCH.217
ffffffff8219f750 0000000000000018 d CSWTCH.22
-ffffffff82033580 0000000000000023 d CSWTCH.221
ffffffff8213de80 0000000000000028 d CSWTCH.222
+ffffffff82033580 0000000000000023 d CSWTCH.223
ffffffff82216c10 0000000000000014 d CSWTCH.225
ffffffff82216bf0 0000000000000014 d CSWTCH.232
ffffffff82216be0 0000000000000010 d CSWTCH.234
@@ -27052,7 +27052,7 @@
ffffffff821b3800 0000000000000188 d CSWTCH.24
ffffffff821f3340 0000000000000058 d CSWTCH.242
ffffffff82158c60 0000000000000030 d CSWTCH.244
-ffffffff821a9868 000000000000000a d CSWTCH.255
+ffffffff821a9868 000000000000000a d CSWTCH.258
ffffffff82106a20 0000000000000010 d CSWTCH.261
ffffffff821a42a0 0000000000000004 d CSWTCH.261
ffffffff8203d9e0 0000000000000030 d CSWTCH.265
@@ -27059,12 +27059,12 @@
ffffffff82126780 0000000000000028 d CSWTCH.27
ffffffff8214d360 0000000000000040 d CSWTCH.278
ffffffff82136f80 0000000000000024 d CSWTCH.28
-ffffffff821b3000 0000000000000024 d CSWTCH.281
-ffffffff821b2fc0 0000000000000024 d CSWTCH.282
-ffffffff8210ed40 000000000000002c d CSWTCH.289
-ffffffff8210ed00 000000000000002b d CSWTCH.290
-ffffffff8210ecc0 000000000000002c d CSWTCH.292
+ffffffff821b3000 0000000000000024 d CSWTCH.285
+ffffffff821b2fc0 0000000000000024 d CSWTCH.286
+ffffffff8210ed40 000000000000002c d CSWTCH.292
ffffffff821b3ae0 0000000000000020 d CSWTCH.292
+ffffffff8210ed00 000000000000002b d CSWTCH.293
+ffffffff8210ecc0 000000000000002c d CSWTCH.295
ffffffff8214d340 0000000000000020 d CSWTCH.296
ffffffff82146121 0000000000000006 d CSWTCH.3
ffffffff821b7ba0 0000000000000020 d CSWTCH.3
@@ -27075,17 +27075,17 @@
ffffffff821d3c40 0000000000000020 d CSWTCH.31
ffffffff820ff780 0000000000000004 d CSWTCH.318
ffffffff821b5cc0 0000000000000038 d CSWTCH.33
-ffffffff8214efa0 0000000000000010 d CSWTCH.334
+ffffffff8214efa0 0000000000000010 d CSWTCH.346
ffffffff8214a8c0 0000000000000018 d CSWTCH.35
-ffffffff8210ecb0 000000000000000c d CSWTCH.359
-ffffffff8202cae0 000000000000002c d CSWTCH.360
+ffffffff8210ecb0 000000000000000c d CSWTCH.362
ffffffff82016300 0000000000000020 d CSWTCH.363
ffffffff821fce00 0000000000000040 d CSWTCH.38
-ffffffff82032780 0000000000000074 d CSWTCH.387
+ffffffff8202cae0 000000000000002c d CSWTCH.381
+ffffffff82032780 0000000000000074 d CSWTCH.390
ffffffff82118100 0000000000000018 d CSWTCH.40
ffffffff821598a0 0000000000000020 d CSWTCH.41
-ffffffff82032760 0000000000000020 d CSWTCH.428
ffffffff82139a20 0000000000000038 d CSWTCH.43
+ffffffff82032760 0000000000000020 d CSWTCH.431
ffffffff82015d40 0000000000000040 d CSWTCH.45
ffffffff821399e0 0000000000000040 d CSWTCH.45
ffffffff822194e0 000000000000000c d CSWTCH.450
@@ -27092,5 +27092,5 @@
ffffffff8214d2e0 0000000000000048 d CSWTCH.459
-ffffffff8210eca0 000000000000000c d CSWTCH.464
+ffffffff8210eca0 000000000000000c d CSWTCH.467
ffffffff821399c0 0000000000000020 d CSWTCH.47
ffffffff8214a8e0 00000000000000c8 d CSWTCH.48
ffffffff82028ac0 0000000000000018 d CSWTCH.49
@@ -27097,8 +27097,8 @@
ffffffff821399a0 0000000000000020 d CSWTCH.49
-ffffffff82032740 0000000000000018 d CSWTCH.507
-ffffffff82032730 000000000000000c d CSWTCH.508
-ffffffff82032720 000000000000000c d CSWTCH.509
ffffffff82139960 0000000000000030 d CSWTCH.51
+ffffffff82032740 0000000000000018 d CSWTCH.510
+ffffffff82032730 000000000000000c d CSWTCH.511
+ffffffff82032720 000000000000000c d CSWTCH.512
ffffffff821595c0 0000000000000100 d CSWTCH.52
ffffffff821b6240 0000000000000018 d CSWTCH.52
ffffffff821371c0 0000000000000024 d CSWTCH.523
@@ -27125,7 +27125,7 @@
ffffffff82139680 0000000000000058 d CSWTCH.72
ffffffff82139620 0000000000000048 d CSWTCH.74
ffffffff8213c740 0000000000000020 d CSWTCH.74
-ffffffff821f04a0 0000000000000018 d CSWTCH.753
+ffffffff821f04a0 0000000000000018 d CSWTCH.766
ffffffff8200e4e0 0000000000000020 d CSWTCH.77
ffffffff821bffc0 0000000000000018 d CSWTCH.78
ffffffff8200e4c0 0000000000000020 d CSWTCH.79
1|android_x86:/ #
2022-10-21 2:14 GMT+08:00, Alexander Potapenko <glider@xxxxxxxxxx>:
> On Wed, Oct 19, 2022 at 2:37 PM 'Marco Elver' via kasan-dev <
> kasan-dev@xxxxxxxxxxxxxxxx> wrote:
>
>> On Thu, Oct 20, 2022 at 04:07AM +0800, youling 257 wrote:
>> > That is i did,i already test, remove "u64 __tmp…kmsan_unpoison_memory",
>> no help.
>> > i only remove kmsan_copy_to_user, fix my issue.
>>
>> Ok - does only the below work (without the reverts)?
>>
>> diff --git a/include/linux/kmsan-checks.h b/include/linux/kmsan-checks.h
>> index c4cae333deec..eb05caa8f523 100644
>> --- a/include/linux/kmsan-checks.h
>> +++ b/include/linux/kmsan-checks.h
>> @@ -73,8 +73,8 @@ static inline void kmsan_unpoison_memory(const void
>> *address, size_t size)
>> static inline void kmsan_check_memory(const void *address, size_t size)
>> {
>> }
>> -static inline void kmsan_copy_to_user(void __user *to, const void *from,
>> - size_t to_copy, size_t left)
>> +static __always_inline void kmsan_copy_to_user(void __user *to, const
>> void *from,
>> + size_t to_copy, size_t
>> left)
>> {
>> }
>>
>>
>> ... because when you say only removing kmsan_copy_to_user() (from
>> instrument_put_user()) works, it really doesn't make any sense. The only
>> explanation would be if the compiler inlining is broken.
>>
>>
> If what Marco suggests does not help, could you post the output of `nm -S
> vmlinux` with and without your revert so that we can see which functions
> were affected by the change?
>
> Unfortunately the top results are of no help, do you have the `perf` tool
> available in your system?
>
>
>> --
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>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/kasan-dev/Y1Bt%2BIa93mVV/lT3%40elver.google.com
>> .
>>
>
>
> --
> Alexander Potapenko
> Software Engineer
>
> Google Germany GmbH
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