From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Roman Gushchin <guro@fb.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Michal Hocko <mhocko@kernel.org>, Rik van Riel <riel@surriel.com>,
Wonhyuk Yang <vvghjk1234@gmail.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 22/65] memblock: do not start bottom-up allocations with kernel_end
Date: Mon, 8 Feb 2021 16:00:54 +0100 [thread overview]
Message-ID: <20210208145811.096767670@linuxfoundation.org> (raw)
In-Reply-To: <20210208145810.230485165@linuxfoundation.org>
From: Roman Gushchin <guro@fb.com>
[ Upstream commit 2dcb3964544177c51853a210b6ad400de78ef17d ]
With kaslr the kernel image is placed at a random place, so starting the
bottom-up allocation with the kernel_end can result in an allocation
failure and a warning like this one:
hugetlb_cma: reserve 2048 MiB, up to 2048 MiB per node
------------[ cut here ]------------
memblock: bottom-up allocation failed, memory hotremove may be affected
WARNING: CPU: 0 PID: 0 at mm/memblock.c:332 memblock_find_in_range_node+0x178/0x25a
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 5.10.0+ #1169
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014
RIP: 0010:memblock_find_in_range_node+0x178/0x25a
Code: e9 6d ff ff ff 48 85 c0 0f 85 da 00 00 00 80 3d 9b 35 df 00 00 75 15 48 c7 c7 c0 75 59 88 c6 05 8b 35 df 00 01 e8 25 8a fa ff <0f> 0b 48 c7 44 24 20 ff ff ff ff 44 89 e6 44 89 ea 48 c7 c1 70 5c
RSP: 0000:ffffffff88803d18 EFLAGS: 00010086 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000240000000 RCX: 00000000ffffdfff
RDX: 00000000ffffdfff RSI: 00000000ffffffea RDI: 0000000000000046
RBP: 0000000100000000 R08: ffffffff88922788 R09: 0000000000009ffb
R10: 00000000ffffe000 R11: 3fffffffffffffff R12: 0000000000000000
R13: 0000000000000000 R14: 0000000080000000 R15: 00000001fb42c000
FS: 0000000000000000(0000) GS:ffffffff88f71000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffa080fb401000 CR3: 00000001fa80a000 CR4: 00000000000406b0
Call Trace:
memblock_alloc_range_nid+0x8d/0x11e
cma_declare_contiguous_nid+0x2c4/0x38c
hugetlb_cma_reserve+0xdc/0x128
flush_tlb_one_kernel+0xc/0x20
native_set_fixmap+0x82/0xd0
flat_get_apic_id+0x5/0x10
register_lapic_address+0x8e/0x97
setup_arch+0x8a5/0xc3f
start_kernel+0x66/0x547
load_ucode_bsp+0x4c/0xcd
secondary_startup_64_no_verify+0xb0/0xbb
random: get_random_bytes called from __warn+0xab/0x110 with crng_init=0
---[ end trace f151227d0b39be70 ]---
At the same time, the kernel image is protected with memblock_reserve(),
so we can just start searching at PAGE_SIZE. In this case the bottom-up
allocation has the same chances to success as a top-down allocation, so
there is no reason to fallback in the case of a failure. All together it
simplifies the logic.
Link: https://lkml.kernel.org/r/20201217201214.3414100-2-guro@fb.com
Fixes: 8fabc623238e ("powerpc: Ensure that swiotlb buffer is allocated from low memory")
Signed-off-by: Roman Gushchin <guro@fb.com>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Wonhyuk Yang <vvghjk1234@gmail.com>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
mm/memblock.c | 49 ++++++-------------------------------------------
1 file changed, 6 insertions(+), 43 deletions(-)
diff --git a/mm/memblock.c b/mm/memblock.c
index c4b16cae2bc9b..11f6ae37d6699 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -257,14 +257,6 @@ __memblock_find_range_top_down(phys_addr_t start, phys_addr_t end,
*
* Find @size free area aligned to @align in the specified range and node.
*
- * When allocation direction is bottom-up, the @start should be greater
- * than the end of the kernel image. Otherwise, it will be trimmed. The
- * reason is that we want the bottom-up allocation just near the kernel
- * image so it is highly likely that the allocated memory and the kernel
- * will reside in the same node.
- *
- * If bottom-up allocation failed, will try to allocate memory top-down.
- *
* Return:
* Found address on success, 0 on failure.
*/
@@ -273,8 +265,6 @@ static phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
phys_addr_t end, int nid,
enum memblock_flags flags)
{
- phys_addr_t kernel_end, ret;
-
/* pump up @end */
if (end == MEMBLOCK_ALLOC_ACCESSIBLE ||
end == MEMBLOCK_ALLOC_KASAN)
@@ -283,40 +273,13 @@ static phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
/* avoid allocating the first page */
start = max_t(phys_addr_t, start, PAGE_SIZE);
end = max(start, end);
- kernel_end = __pa_symbol(_end);
-
- /*
- * try bottom-up allocation only when bottom-up mode
- * is set and @end is above the kernel image.
- */
- if (memblock_bottom_up() && end > kernel_end) {
- phys_addr_t bottom_up_start;
-
- /* make sure we will allocate above the kernel */
- bottom_up_start = max(start, kernel_end);
- /* ok, try bottom-up allocation first */
- ret = __memblock_find_range_bottom_up(bottom_up_start, end,
- size, align, nid, flags);
- if (ret)
- return ret;
-
- /*
- * we always limit bottom-up allocation above the kernel,
- * but top-down allocation doesn't have the limit, so
- * retrying top-down allocation may succeed when bottom-up
- * allocation failed.
- *
- * bottom-up allocation is expected to be fail very rarely,
- * so we use WARN_ONCE() here to see the stack trace if
- * fail happens.
- */
- WARN_ONCE(IS_ENABLED(CONFIG_MEMORY_HOTREMOVE),
- "memblock: bottom-up allocation failed, memory hotremove may be affected\n");
- }
-
- return __memblock_find_range_top_down(start, end, size, align, nid,
- flags);
+ if (memblock_bottom_up())
+ return __memblock_find_range_bottom_up(start, end, size, align,
+ nid, flags);
+ else
+ return __memblock_find_range_top_down(start, end, size, align,
+ nid, flags);
}
/**
--
2.27.0
next prev parent reply other threads:[~2021-02-08 16:33 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 15:00 [PATCH 5.4 00/65] 5.4.97-rc1 review Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 01/65] USB: serial: cp210x: add pid/vid for WSDA-200-USB Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 02/65] USB: serial: cp210x: add new VID/PID for supporting Teraoka AD2000 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 03/65] USB: serial: option: Adding support for Cinterion MV31 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 04/65] arm64: dts: qcom: c630: keep both touchpad devices enabled Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 05/65] Input: i8042 - unbreak Pegatron C15B Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 06/65] arm64: dts: amlogic: meson-g12: Set FL-adj property value Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 07/65] arm64: dts: rockchip: fix vopl iommu irq on px30 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 08/65] bpf, cgroup: Fix optlen WARN_ON_ONCE toctou Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 09/65] bpf, cgroup: Fix problematic bounds check Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 10/65] um: virtio: free vu_dev only with the contained struct device Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 11/65] rxrpc: Fix deadlock around release of dst cached on udp tunnel Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 12/65] arm64: dts: ls1046a: fix dcfg address range Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 13/65] igc: set the default return value to -IGC_ERR_NVM in igc_write_nvm_srwr Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 14/65] igc: check return value of ret_val in igc_config_fc_after_link_up Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 15/65] i40e: Revert "i40e: dont report link up for a VF who hasnt enabled queues" Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 16/65] net/mlx5: Fix leak upon failure of rule creation Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 17/65] net: lapb: Copy the skb before sending a packet Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 18/65] net: mvpp2: TCAM entry enable should be written after SRAM data Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 19/65] r8169: fix WoL on shutdown if CONFIG_DEBUG_SHIRQ is set Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 20/65] ARM: dts: sun7i: a20: bananapro: Fix ethernet phy-mode Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 21/65] nvmet-tcp: fix out-of-bounds access when receiving multiple h2cdata PDUs Greg Kroah-Hartman
2021-02-08 15:00 ` Greg Kroah-Hartman [this message]
2021-02-08 15:00 ` [PATCH 5.4 23/65] USB: gadget: legacy: fix an error code in eth_bind() Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 24/65] USB: usblp: dont call usb_set_interface if theres a single alt Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 25/65] usb: renesas_usbhs: Clear pipe running flag in usbhs_pkt_pop() Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 26/65] usb: dwc2: Fix endpoint direction check in ep_from_windex Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 5.4 27/65] usb: dwc3: fix clock issue during resume in OTG mode Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 28/65] usb: xhci-mtk: fix unreleased bandwidth data Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 29/65] usb: xhci-mtk: skip dropping bandwidth of unchecked endpoints Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 30/65] usb: xhci-mtk: break loop when find the endpoint to drop Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 31/65] usb: host: xhci-plat: add priv quirk for skip PHY initialization Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 32/65] ovl: fix dentry leak in ovl_get_redirect Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 33/65] mac80211: fix station rate table updates on assoc Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 34/65] fgraph: Initialize tracing_graph_pause at task creation Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 35/65] kretprobe: Avoid re-registration of the same kretprobe earlier Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 36/65] libnvdimm/dimm: Avoid race between probe and available_slots_show() Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 37/65] genirq/msi: Activate Multi-MSI early when MSI_FLAG_ACTIVATE_EARLY is set Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 38/65] xhci: fix bounce buffer usage for non-sg list case Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 39/65] cifs: report error instead of invalid when revalidating a dentry fails Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 40/65] smb3: Fix out-of-bounds bug in SMB2_negotiate() Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 41/65] smb3: fix crediting for compounding when only one request in flight Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 42/65] mmc: core: Limit retries when analyse of SDIO tuples fails Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 43/65] drm/amd/display: Revert "Fix EDID parsing after resume from suspend" Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 44/65] nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 45/65] KVM: SVM: Treat SVM as unsupported when running as an SEV guest Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 46/65] KVM: x86: Update emulator context mode if SYSENTER xfers to 64-bit mode Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 47/65] ARM: footbridge: fix dc21285 PCI configuration accessors Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 48/65] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 49/65] mm: hugetlb: fix a race between freeing and dissolving the page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 50/65] mm: hugetlb: fix a race between isolating and freeing page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 51/65] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 52/65] mm, compaction: move high_pfn to the for loop scope Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 53/65] mm: thp: fix MADV_REMOVE deadlock on shmem THP Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 54/65] x86/build: Disable CET instrumentation in the kernel Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 55/65] x86/apic: Add extra serialization for non-serializing MSRs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 56/65] iwlwifi: mvm: dont send RFH_QUEUE_CONFIG_CMD with no queues Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 57/65] Input: xpad - sync supported devices with fork on GitHub Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 58/65] iommu/vt-d: Do not use flush-queue when caching-mode is on Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 59/65] md: Set prev_flush_start and flush_bio in an atomic way Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 60/65] igc: Report speed and duplex as unknown when device is runtime suspended Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 61/65] neighbour: Prevent a dead entry from updating gc_list Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 62/65] net: ip_tunnel: fix mtu calculation Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 63/65] net: dsa: mv88e6xxx: override existent unicast portvec in port_fdb_add Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 64/65] net: sched: replaced invalid qdisc tree flush helper in qdisc_replace Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 5.4 65/65] usb: host: xhci: mvebu: make USB 3.0 PHY optional for Armada 3720 Greg Kroah-Hartman
2021-02-08 17:39 ` [PATCH 5.4 00/65] 5.4.97-rc1 review Florian Fainelli
2021-02-10 8:28 ` Greg Kroah-Hartman
2021-02-08 20:42 ` Shuah Khan
2021-02-09 5:50 ` Naresh Kamboju
2021-02-09 11:00 ` Igor Torrente
2021-02-10 8:29 ` Greg Kroah-Hartman
2021-02-09 18:14 ` Guenter Roeck
2021-02-10 1:23 ` Ross Schmidt
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