This is a note to let you know that I've just added the patch titled
coresight: etm4x: Fix width of CCITMIN field
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
coresight-etm4x-fix-width-of-ccitmin-field.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cc0271a339cc70cae914c3ec20edc2a8058407da Mon Sep 17 00:00:00 2001
From: James Clark <james.clark@xxxxxxx>
Date: Wed, 1 Nov 2023 11:52:06 +0000
Subject: coresight: etm4x: Fix width of CCITMIN field
From: James Clark <james.clark@xxxxxxx>
commit cc0271a339cc70cae914c3ec20edc2a8058407da upstream.
CCITMIN is a 12 bit field and doesn't fit in a u8, so extend it to u16.
This probably wasn't an issue previously because values higher than 255
never occurred.
But since commit 4aff040bcc8d ("coresight: etm: Override TRCIDR3.CCITMIN
on errata affected cpus"), a comparison with 256 was done to enable the
errata, generating the following W=1 build error:
coresight-etm4x-core.c:1188:24: error: result of comparison of
constant 256 with expression of type 'u8' (aka 'unsigned char') is
always false [-Werror,-Wtautological-constant-out-of-range-compare]
if (drvdata->ccitmin == 256)
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 2e1cdfe184b5 ("coresight-etm4x: Adding CoreSight ETM4x driver")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202310302043.as36UFED-lkp@xxxxxxxxx/
Reviewed-by: Mike Leach <mike.leach@xxxxxxxxxx>
Signed-off-by: James Clark <james.clark@xxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Link: https://lore.kernel.org/r/20231101115206.70810-1-james.clark@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/hwtracing/coresight/coresight-etm4x.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -363,7 +363,7 @@ struct etmv4_drvdata {
u8 ctxid_size;
u8 vmid_size;
u8 ccsize;
- u8 ccitmin;
+ u16 ccitmin;
u8 s_ex_level;
u8 ns_ex_level;
u8 q_support;
Patches currently in stable-queue which might be from james.clark@xxxxxxx are
queue-4.19/coresight-etm4x-fix-width-of-ccitmin-field.patch
