The use case is when called by struct hmm_devmem_ops.fault() which passes a const struct page * pointer and hmm_devmem_page_get_drvdata() is called to get the private data. Since HMM was only recently added, it only affects kernels after September 8, 2017. > -----Original Message----- > From: Andrew Morton [mailto:akpm@xxxxxxxxxxxxxxxxxxxx] > Sent: Monday, October 2, 2017 2:41 PM > To: Jérôme Glisse <jglisse@xxxxxxxxxx> > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx; Ralph Campbell > <rcampbell@xxxxxxxxxx> > Subject: Re: [PATCH] mm/hmm: constify hmm_devmem_page_get_drvdata() > parameter > > On Mon, 2 Oct 2017 15:32:54 -0400 Jérôme Glisse <jglisse@xxxxxxxxxx> > wrote: > > > From: Ralph Campbell <rcampbell@xxxxxxxxxx> > > > > Constify pointer parameter to avoid issue when use from code that only > > has const struct page pointer to use in the first place. > > That's rather vague. Does such calling code exist in the kernel? This affects the > which-kernel-gets-patched decision. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href
