Re: [PATCH v2] nvdimm/pmem: remove test_and_clear_pmem_poison()

[Alison Schofield <alison.schofield@intel.com>]

On Wed, Sep 23, 2026 at 01:53:18PM +0800, Kaitao Cheng wrote:
> From: Kaitao Cheng <chengkaitao@kylinos.cn>
> 
> The pmem driver provides test_and_clear_pmem_poison() only to handle
> the CONFIG_MEMORY_FAILURE dependency of TestClearPageHWPoison().
> The wrapper has no other pmem-specific behavior.
> 
> Define the HWPoison test-and-change helpers to return false when
> CONFIG_MEMORY_FAILURE is disabled.  This allows pmem to call
> TestClearPageHWPoison() directly in all configurations.

I see this merged here:
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?h=mm-stable&id=2492d9c0afc02cebe8318155829e7d03bea617b8

Still not sure how all that works, but I got an email saying merged, yet
this list was not on the email thread.  


> 
> Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
> Acked-by: David Hildenbrand (Arm) <david@kernel.org>
> Acked-by: Muchun Song <muchun.song@linux.dev>
> Reviewed-by: Oscar Salvador <osalvador@suse.de>
> ---
> Changes in v2 (David Hildenbrand, Oscar Salvador):
> - squash patch#1 into patch#2.
> 
> Link to v1:
> https://lore.kernel.org/all/20260903053535.17611-1-kaitao.cheng@linux.dev/
> ---
>  drivers/nvdimm/pmem.c      |  2 +-
>  drivers/nvdimm/pmem.h      | 12 ------------
>  include/linux/page-flags.h |  1 +
>  3 files changed, 2 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
> index 30a51c365ce8..5fb86595e8bd 100644
> --- a/drivers/nvdimm/pmem.c
> +++ b/drivers/nvdimm/pmem.c
> @@ -80,7 +80,7 @@ static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset,
>  		 * here since we're in the driver I/O path and
>  		 * outstanding I/O requests pin the dev_pagemap.
>  		 */
> -		if (test_and_clear_pmem_poison(page))
> +		if (TestClearPageHWPoison(page))
>  			clear_mce_nospec(pfn);
>  	}
>  }
> diff --git a/drivers/nvdimm/pmem.h b/drivers/nvdimm/pmem.h
> index a48509f90196..76870505dd79 100644
> --- a/drivers/nvdimm/pmem.h
> +++ b/drivers/nvdimm/pmem.h
> @@ -1,7 +1,6 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  #ifndef __NVDIMM_PMEM_H__
>  #define __NVDIMM_PMEM_H__
> -#include <linux/page-flags.h>
>  #include <linux/badblocks.h>
>  #include <linux/memremap.h>
>  #include <linux/types.h>
> @@ -31,15 +30,4 @@ long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
>  		long nr_pages, enum dax_access_mode mode, void **kaddr,
>  		unsigned long *pfn);
>  
> -#ifdef CONFIG_MEMORY_FAILURE
> -static inline bool test_and_clear_pmem_poison(struct page *page)
> -{
> -	return TestClearPageHWPoison(page);
> -}
> -#else
> -static inline bool test_and_clear_pmem_poison(struct page *page)
> -{
> -	return false;
> -}
> -#endif
>  #endif /* __NVDIMM_PMEM_H__ */
> diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> index ae2ebaed6d4d..3dc79c0c5adf 100644
> --- a/include/linux/page-flags.h
> +++ b/include/linux/page-flags.h
> @@ -655,6 +655,7 @@ TESTSCFLAG(HWPoison, hwpoison, PF_ANY)
>  #define __PG_HWPOISON (1UL << PG_hwpoison)
>  #else
>  PAGEFLAG_FALSE(HWPoison, hwpoison)
> +TESTSCFLAG_FALSE(HWPoison, hwpoison)
>  #define __PG_HWPOISON 0
>  #endif
>  
> -- 
> 2.54.0 (Apple Git-157)
>