[PATCH v2] tools/mm: add hwpoison-panic tool

[Breno Leitao]

Hello Miaohe,

First of all, thanks for looking at this one.

On Thu, Aug 13, 2026 at 03:32:34PM +0800, Miaohe Lin wrote:
> On 2026/8/3 19:31, Breno Leitao wrote:
> > +static int pick_kpageflags_phys_addr(uint64_t want, uint64_t *phys_addr)
> > +{
> > +	uint64_t pfn = (16UL << 20) / page_size;
> 
> Could we use SZ_16M macro here?

Sure, for that I will include ../../include/linux/sizes.h in the next
version.

> > +/* hard_offline_page() injects with MF_SW_SIMULATED, so unpoison is allowed. */
> > +static void unpoison_pfn(uint64_t pfn)
> > +{
> > +	char path[PATH_MAX], buf[32];
> > +	const char *debugfs;
> > +	int fd, len;
> > +
> > +	debugfs = debugfs__mount();
> 
> I might be miss something but I can't find the implementation of debugfs__mount.

It is an ugly macro declared in tools/lib/api/fs/fs.h:

        #define FS(name)                                \
                const char *name##__mountpoint(void);   \
                const char *name##__mount(void);        \
                bool name##__configured(void);

And then:
        FS(debugfs)

> > +	if (access(INJECT_PATH, W_OK))
> > +		fatal("%s not present (no MEMORY_HOTPLUG?)\n", INJECT_PATH);
> 
> MEMORY_HOTPLUG?

lol. it should be MEMORY_FAILURE

I will get these points fixed and respin.
--breno