From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Andreas Larsson <andreas@gaisler.com>,
Mike Rapoport <rppt@linux.ibm.com>,
"David S . Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>,
sparclinux@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 4/8] sparc32: Limit memblock allocation to low memory
Date: Tue, 2 Mar 2021 06:59:31 -0500 [thread overview]
Message-ID: <20210302115935.63777-4-sashal@kernel.org> (raw)
In-Reply-To: <20210302115935.63777-1-sashal@kernel.org>
From: Andreas Larsson <andreas@gaisler.com>
[ Upstream commit bda166930c37604ffa93f2425426af6921ec575a ]
Commit cca079ef8ac29a7c02192d2bad2ffe4c0c5ffdd0 changed sparc32 to use
memblocks instead of bootmem, but also made high memory available via
memblock allocation which does not work together with e.g. phys_to_virt
and can lead to kernel panic.
This changes back to only low memory being allocatable in the early
stages, now using memblock allocation.
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/sparc/mm/init_32.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
index 3b7092d9ea8f..4abe4bf08377 100644
--- a/arch/sparc/mm/init_32.c
+++ b/arch/sparc/mm/init_32.c
@@ -240,6 +240,9 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
+ /* Only allow low memory to be allocated via memblock allocation */
+ memblock_set_current_limit(max_low_pfn << PAGE_SHIFT);
+
return max_pfn;
}
--
2.30.1
next prev parent reply other threads:[~2021-03-03 0:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 11:59 [PATCH AUTOSEL 4.4 1/8] mmc: mxs-mmc: Fix a resource leak in an error handling path in 'mxs_mmc_probe()' Sasha Levin
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 2/8] mmc: mediatek: fix race condition between msdc_request_timeout and irq Sasha Levin
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 3/8] powerpc/perf: Record counter overflow always if SAMPLE_IP is unset Sasha Levin
2021-03-02 11:59 ` Sasha Levin [this message]
2021-03-03 8:21 ` [PATCH AUTOSEL 4.4 4/8] sparc32: Limit memblock allocation to low memory Andreas Larsson
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 5/8] x86, build: use objtool mcount Sasha Levin
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 6/8] PCI: xgene-msi: Fix race in installing chained irq handler Sasha Levin
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 7/8] s390/smp: __smp_rescan_cpus() - move cpumask away from stack Sasha Levin
2021-03-02 11:59 ` [PATCH AUTOSEL 4.4 8/8] scsi: libiscsi: Fix iscsi_prep_scsi_cmd_pdu() error handling Sasha Levin
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