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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nathan Chancellor <natechancellor@gmail.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Paul Burton <paulburton@kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>,
	linux-mips@vger.kernel.org, clang-built-linux@googlegroups.com,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.4 17/58] MIPS: vdso: Wrap -mexplicit-relocs in cc-option
Date: Thu,  5 Mar 2020 12:13:38 -0500	[thread overview]
Message-ID: <20200305171420.29595-17-sashal@kernel.org> (raw)
In-Reply-To: <20200305171420.29595-1-sashal@kernel.org>

From: Nathan Chancellor <natechancellor@gmail.com>

[ Upstream commit 72cf3b3df423c1bbd8fa1056fed009d3a260f8a9 ]

Clang does not support this option and errors out:

clang-11: error: unknown argument: '-mexplicit-relocs'

Clang does not appear to need this flag like GCC does because the jalr
check that was added in commit 976c23af3ee5 ("mips: vdso: add build
time check that no 'jalr t9' calls left") passes just fine with

$ make ARCH=mips CC=clang CROSS_COMPILE=mipsel-linux-gnu- malta_defconfig arch/mips/vdso/

even before commit d3f703c4359f ("mips: vdso: fix 'jalr t9' crash in
vdso code").

-mrelax-pic-calls has been supported since clang 9, which is the
earliest version that could build a working MIPS kernel, and it is the
default for clang so just leave it be.

Fixes: d3f703c4359f ("mips: vdso: fix 'jalr t9' crash in vdso code")
Link: https://github.com/ClangBuiltLinux/linux/issues/890
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: clang-built-linux@googlegroups.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/mips/vdso/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 08c835d48520b..3dcfdee678fb9 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -29,7 +29,7 @@ endif
 cflags-vdso := $(ccflags-vdso) \
 	$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS))) \
 	-O3 -g -fPIC -fno-strict-aliasing -fno-common -fno-builtin -G 0 \
-	-mrelax-pic-calls -mexplicit-relocs \
+	-mrelax-pic-calls $(call cc-option, -mexplicit-relocs) \
 	-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING \
 	$(call cc-option, -fno-asynchronous-unwind-tables) \
 	$(call cc-option, -fno-stack-protector)
-- 
2.20.1


  parent reply	other threads:[~2020-03-05 17:15 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-05 17:13 [PATCH AUTOSEL 5.4 01/58] ACPI: watchdog: Allow disabling WDAT at boot Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 02/58] HID: apple: Add support for recent firmware on Magic Keyboards Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 03/58] HID: core: fix off-by-one memset in hid_report_raw_event() Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 04/58] HID: core: increase HID report buffer size to 8KiB Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 05/58] HID: hiddev: Fix race in in hiddev_disconnect() Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 06/58] HID: alps: Fix an error handling path in 'alps_input_configured()' Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 07/58] i2c: altera: Fix potential integer overflow Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 08/58] ACPI: watchdog: Set default timeout in probe Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 09/58] HID: i2c-hid: add Trekstor Surfbook E11B to descriptor override Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 10/58] mips: vdso: fix 'jalr t9' crash in vdso code Sasha Levin
2020-08-29 13:08   ` Hauke Mehrtens
2020-08-29 13:56     ` Sasha Levin
2020-08-29 14:37       ` Hauke Mehrtens
2020-08-30  2:23         ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 11/58] MIPS: Disable VDSO time functionality on microMIPS Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 12/58] mips: vdso: add build time check that no 'jalr t9' calls left Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 13/58] MIPS: VPE: Fix a double free and a memory leak in 'release_vpe()' Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 14/58] HID: hid-bigbenff: fix general protection fault caused by double kfree Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 15/58] HID: hid-bigbenff: call hid_hw_stop() in case of error Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 16/58] HID: hid-bigbenff: fix race condition for scheduled work during removal Sasha Levin
2020-03-05 17:13 ` Sasha Levin [this message]
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 18/58] selftests/rseq: Fix out-of-tree compilation Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 19/58] tracing: Fix number printing bug in print_synth_event() Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 20/58] nl80211: fix potential leak in AP start Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 21/58] cfg80211: check reg_rule for NULL in handle_channel_custom() Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 22/58] mac80211: Remove a redundant mutex unlock Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 23/58] scsi: libfc: free response frame from GPN_ID Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 24/58] netfilter: ipset: Fix "INFO: rcu detected stall in hash_xxx" reports Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 25/58] netfilter: ipset: Fix forceadd evaluation path Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 26/58] vhost: Check docket sk_family instead of call getname Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 27/58] net: usb: qmi_wwan: restore mtu min/max values after raw_ip switch Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 28/58] hv_netvsc: Fix unwanted wakeup in netvsc_attach() Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 29/58] net: ks8851-ml: Fix IRQ handling and locking Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 30/58] mac80211: rx: avoid RCU list traversal under mutex Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 31/58] net: ll_temac: Fix race condition causing TX hang Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 32/58] net: ll_temac: Add more error handling of dma_map_single() calls Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 33/58] net: ll_temac: Fix RX buffer descriptor handling on GFP_ATOMIC pressure Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 34/58] net: ll_temac: Handle DMA halt condition caused by buffer underrun Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 35/58] blk-mq: insert passthrough request into hctx->dispatch directly Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 36/58] drm/amdgpu: fix memory leak during TDR test(v2) Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13   ` Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 37/58] kbuild: fix DT binding schema rule to detect command line changes Sasha Levin
2020-03-05 17:13 ` [PATCH AUTOSEL 5.4 38/58] kbuild: add dtbs_check to PHONY Sasha Levin
2020-03-05 17:14 ` [PATCH AUTOSEL 5.4 39/58] kbuild: add dt_binding_check to PHONY in a correct place Sasha Levin

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