Re: [PATCH 01/10] x86/mm/numa: Remove uninitialized_var() usage
From: Thomas Gleixner <hidden>
Date: 2020-06-04 07:58:22
Also in:
linux-block, linux-clk, linux-ide, linux-mm, linux-spi, linux-wireless, lkml
Kees Cook [off-list ref] writes:
-#ifdef NODE_NOT_IN_PAGE_FLAGS
- pfn_align = node_map_pfn_alignment();
- if (pfn_align && pfn_align < PAGES_PER_SECTION) {
- printk(KERN_WARNING "Node alignment %LuMB < min %LuMB, rejecting NUMA config\n",
- PFN_PHYS(pfn_align) >> 20,
- PFN_PHYS(PAGES_PER_SECTION) >> 20);
- return -EINVAL;
+ if (IS_ENABLED(NODE_NOT_IN_PAGE_FLAGS)) {Hrm, clever ...
quoted hunk ↗ jump to hunk
+ unsigned long pfn_align = node_map_pfn_alignment(); + + if (pfn_align && pfn_align < PAGES_PER_SECTION) { + pr_warn("Node alignment %LuMB < min %LuMB, rejecting NUMA config\n", + PFN_PHYS(pfn_align) >> 20, + PFN_PHYS(PAGES_PER_SECTION) >> 20); + return -EINVAL; + } } -#endif if (!numa_meminfo_cover_memory(mi)) return -EINVAL;diff --git a/include/linux/page-flags-layout.h b/include/linux/page-flags-layout.h index 71283739ffd2..1a4cdec2bd29 100644 --- a/include/linux/page-flags-layout.h +++ b/include/linux/page-flags-layout.h@@ -100,7 +100,7 @@ * there. This includes the case where there is no node, so it is implicit. */ #if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) -#define NODE_NOT_IN_PAGE_FLAGS +#define NODE_NOT_IN_PAGE_FLAGS 1
but if we ever lose the 1 then the above will silently compile the code
within the IS_ENABLED() section out.
Thanks,
tglx