From mboxrd@z Thu Jan 1 00:00:00 1970 From: catalin.marinas@arm.com (Catalin Marinas) Date: Wed, 13 Sep 2017 10:29:11 -0700 Subject: [PATCH v2 14/28] arm64/sve: Backend logic for setting the vector length In-Reply-To: <1504198860-12951-15-git-send-email-Dave.Martin@arm.com> References: <1504198860-12951-1-git-send-email-Dave.Martin@arm.com> <1504198860-12951-15-git-send-email-Dave.Martin@arm.com> Message-ID: <20170913172911.3ca2h6cpju7etifi@localhost> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Aug 31, 2017 at 06:00:46PM +0100, Dave P Martin wrote: > This patch implements the core logic for changing a task's vector > length on request from userspace. This will be used by the ptrace > and prctl frontends that are implemented in later patches. > > The SVE architecture permits, but does not require, implementations > to support vector lengths that are not a power of two. To handle > this, logic is added to check a requested vector length against a > possibly sparse bitmap of available vector lengths at runtime, so > that the best supported value can be chosen. > > Signed-off-by: Dave Martin > Cc: Alex Benn?e Can this be merged with patch 20? It seems to add the PR_ definitions which get actually used later when the prctl interface is added. -- Catalin