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kernel: bump 5.4 to 5.4.51

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update via update_kernel.sh -v -u 5.4

Removed upstreamed patches:
 350-MIPS-Add-missing-EHB-in-mtc0-mfc0-sequence-for-DSPen.patch

Script refreshed patches:
 902-debloat_proc.patch
 904-debloat_dma_buf.patch

Attempted merge conflict in following patches:
 0024-MIPS-lantiq-revert-DSA-switch-driver-PMU-clock-chang.patch

Build system: x86_64
Build tested: ipq806x (Netgear R7800)

Signed-off-by: John Audia <graysky@archlinux.us>
[fixed sha256sum of the tarball]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
John Audia
2020-07-09 17:22:35 -04:00
committed by Petr Štetiar
parent f93267bccf
commit 039fd27173
5 changed files with 8 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
target/linux/generic/hack-5.4/902-debloat_proc.patch
View File

@@ -29,7 +29,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2989,6 +2989,8 @@ static const struct seq_operations locks
@@ -2992,6 +2992,8 @@ static const struct seq_operations locks
static int __init proc_locks_init(void)
{

2
target/linux/generic/hack-5.4/904-debloat_dma_buf.patch
View File

@@ -45,7 +45,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
selftest.o \
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1299,4 +1299,5 @@ static void __exit dma_buf_deinit(void)
@@ -1295,4 +1295,5 @@ static void __exit dma_buf_deinit(void)
dma_buf_uninit_debugfs();
kern_unmount(dma_buf_mnt);
}

61
target/linux/generic/pending-5.4/350-MIPS-Add-missing-EHB-in-mtc0-mfc0-sequence-for-DSPen.patch
View File

@@ -1,61 +0,0 @@
From db4603e30effd74d4adb6bcdf73072b2c06fafcd Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Fri, 3 Jul 2020 00:07:15 +0200
Subject: [PATCH] MIPS: Add missing EHB in mtc0 -> mfc0 sequence for DSPen
This resolves the hazard between the mtc0 in the change_c0_status() and
the mfc0 in configure_exception_vector(). Without resolving this hazard
configure_exception_vector() could read an old value and would restore
this old value again. This would revert the changes change_c0_status()
did. I checked this by printing out the read_c0_status() at the end of
per_cpu_trap_init() and the ST0_MX is not set without this patch.
The hazard is documented in the MIPS Architecture Reference Manual Vol.
III: MIPS32/microMIPS32 Privileged Resource Architecture (MD00088), rev
6.03 table 8.1 which includes:
Producer | Consumer | Hazard
----------|----------|----------------------------
mtc0 | mfc0 | any coprocessor 0 register
I saw this hazard on an Atheros AR9344 rev 2 SoC with a MIPS 74Kc CPU.
There the change_c0_status() function would activate the DSPen by
setting ST0_MX in the c0_status register. This was reverted and then the
system got a DSP exception when the DSP registers were saved in
save_dsp() in the first process switch. The crash looks like this:
[ 0.089999] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.097796] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.107070] Kernel panic - not syncing: Unexpected DSP exception
[ 0.113470] Rebooting in 1 seconds..
We saw this problem in OpenWrt only on the MIPS 74Kc based Atheros SoCs,
not on the 24Kc based SoCs. We only saw it with kernel 5.4 not with
kernel 4.19, in addition we had to use GCC 8.4 or 9.X, with GCC 8.3 it
did not happen.
In the kernel I bisected this problem to commit 9012d011660e ("compiler:
allow all arches to enable CONFIG_OPTIMIZE_INLINING"), but when this was
reverted it also happened after commit 172dcd935c34b ("MIPS: Always
allocate exception vector for MIPSr2+").
Commit 0b24cae4d535 ("MIPS: Add missing EHB in mtc0 -> mfc0 sequence.")
does similar changes to a different file. I am not sure if there are
more places affected by this problem.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: <stable@vger.kernel.org>
---
arch/mips/kernel/traps.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -2126,6 +2126,7 @@ static void configure_status(void)
change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX,
status_set);
+ back_to_back_c0_hazard();
}
unsigned int hwrena;