From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: mpe@ellerman.id.au
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerepc/book3s64/hash: Align start address correctly with bolt mapping
Date: Mon, 28 Oct 2019 15:21:48 +0530 [thread overview]
Message-ID: <20191028095148.22421-1-aneesh.kumar@linux.ibm.com> (raw)
Without this we can miss mapping the last page covering the end address passed
BUG: Unable to handle kernel data access at 0xc001000406000000
Faulting instruction address: 0xc000000000090790
NIP [c000000000090790] arch_add_memory+0xc0/0x130
LR [c000000000090744] arch_add_memory+0x74/0x130
Call Trace:
arch_add_memory+0x74/0x130 (unreliable)
memremap_pages+0x74c/0xa30
devm_memremap_pages+0x3c/0xa0
pmem_attach_disk+0x188/0x770
nvdimm_bus_probe+0xd8/0x470
really_probe+0x148/0x570
driver_probe_device+0x19c/0x1d0
device_driver_attach+0xcc/0x100
bind_store+0x134/0x1c0
drv_attr_store+0x44/0x60
sysfs_kf_write+0x74/0xc0
kernfs_fop_write+0x1b4/0x290
__vfs_write+0x3c/0x70
vfs_write+0xd0/0x260
ksys_write+0xdc/0x130
system_call+0x5c/0x68
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/mm/book3s64/hash_utils.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 6c123760164e..f66a1c6922d6 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -257,8 +257,10 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
DBG("htab_bolt_mapping(%lx..%lx -> %lx (%lx,%d,%d)\n",
vstart, vend, pstart, prot, psize, ssize);
- for (vaddr = vstart, paddr = pstart; vaddr < vend;
- vaddr += step, paddr += step) {
+ vaddr = ALIGN_DOWN(vstart, step);
+ paddr = ALIGN_DOWN(pstart, step);
+
+ for (; vaddr < vend; vaddr += step, paddr += step) {
unsigned long hash, hpteg;
unsigned long vsid = get_kernel_vsid(vaddr, ssize);
unsigned long vpn = hpt_vpn(vaddr, vsid, ssize);
--
2.21.0
next reply other threads:[~2019-10-28 9:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 9:51 Aneesh Kumar K.V [this message]
2019-10-29 11:08 ` [PATCH] powerepc/book3s64/hash: Align start address correctly with bolt mapping Michael Ellerman
-- strict thread matches above, loose matches on Subject: below --
2019-12-02 6:40 Aneesh Kumar K.V
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