Hi,Greg,
-----原始邮件----- 发件人: "Greg Kroah-Hartman" gregkh@linuxfoundation.org 发送时间:2025-11-27 22:45:04 (星期四) 收件人: stable@vger.kernel.org 抄送: "Greg Kroah-Hartman" gregkh@linuxfoundation.org, patches@lists.linux.dev, "Jiaxun Yang" jiaxun.yang@flygoat.com, "Huacai Chen" chenhuacai@loongson.cn 主题: [PATCH 6.17 051/175] LoongArch: Dont panic if no valid cache info for PCI
Why Don't became Dont when backport this patch to stable branchs?
Huacai
6.17-stable review patch. If anyone has any objections, please let me know.
From: Huacai Chen chenhuacai@loongson.cn
commit a6b533adfc05ba15360631e019d3e18275080275 upstream.
If there is no valid cache info detected (may happen in virtual machine) for pci_dfl_cache_line_size, kernel shouldn't panic. Because in the PCI core it will be evaluated to (L1_CACHE_BYTES >> 2).
Cc: stable@vger.kernel.org Signed-off-by: Jiaxun Yang jiaxun.yang@flygoat.com Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
arch/loongarch/pci/pci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/loongarch/pci/pci.c +++ b/arch/loongarch/pci/pci.c @@ -50,11 +50,11 @@ static int __init pcibios_init(void) */ lsize = cpu_last_level_cache_line_size();
- BUG_ON(!lsize);
- if (lsize) {
pci_dfl_cache_line_size = lsize >> 2;
- pci_dfl_cache_line_size = lsize >> 2;
- pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);- }
return 0; }
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