From: Pingfan Liu <kernelfans@gmail.com> commit fbee6ba2dca30d302efe6bddb3a886f5e964a257 upstream. In lmb_is_removable(), if a section is not present, it should continue to test the rest of the sections in the block. But the current code fails to do so. Fixes: 51925fb3c5c9 ("powerpc/pseries: Implement memory hotplug remove in the kernel") Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Pingfan Liu <kernelfans@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1578632042-12415-1-git-send-email-kernelfans@gmail... Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- arch/powerpc/platforms/pseries/hotplug-memory.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index c2c6f32..fc01a2c 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -366,8 +366,10 @@ static bool lmb_is_removable(struct drmem_lmb *lmb) for (i = 0; i < scns_per_block; i++) { pfn = PFN_DOWN(phys_addr); - if (!pfn_present(pfn)) + if (!pfn_present(pfn)) { + phys_addr += MIN_MEMORY_BLOCK_SIZE; continue; + } rc &= is_mem_section_removable(pfn, PAGES_PER_SECTION); phys_addr += MIN_MEMORY_BLOCK_SIZE; -- 1.8.3