Re: [PATCH 05/15] Add io_uring IO interface
flat view
From: Roman Penyaev <hidden>
Date: 2019-01-17 12:02:21
Also in:
linux-arch, linux-fsdevel
Hi Jens, On 2019-01-16 18:49, Jens Axboe wrote: [...]
quoted hunk ↗ jump to hunk
+static void *io_mem_alloc(size_t size) +{ + gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP | + __GFP_NORETRY; + + return (void *) __get_free_pages(gfp_flags, get_order(size));
Since these pages are shared between kernel and userspace, do we need to care about d-cache aliasing on armv6 (or other "strange" archs which I've never seen) with vivt or vipt cpu caches? E.g. vmalloc_user() targets this problem by aligning kernel address on SHMLBA, so no flush_dcache_page() is required. -- Roman