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Peter Anvin" , Arnd Bergmann , Mathieu Desnoyers Subject: Re: [PATCH v19 13/19] fprobe: Add fprobe_header encoding feature Message-ID: <20241110171638.6661-E-hca@linux.ibm.com> References: <173125372214.172790.6929368952404083802.stgit@devnote2> <173125388510.172790.1161831132316963172.stgit@devnote2> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <173125388510.172790.1161831132316963172.stgit@devnote2> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: GJCKposUAeWJS4L6p4y06TvBF-vByzu7 X-Proofpoint-GUID: n_GXdkFm3pIvgXraT9dt0EiUt6IaSzmq X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 mlxlogscore=345 lowpriorityscore=0 adultscore=0 mlxscore=0 impostorscore=0 bulkscore=0 phishscore=0 clxscore=1015 spamscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411100151 On Mon, Nov 11, 2024 at 12:51:25AM +0900, Masami Hiramatsu (Google) wrote: > From: Masami Hiramatsu (Google) > > Fprobe store its data structure address and size on the fgraph return stack > by __fprobe_header. But most 64bit architecture can combine those to > one unsigned long value because 4 MSB in the kernel address are the same. > With this encoding, fprobe can consume less space on ret_stack. > > This introduces asm/fprobe.h to define arch dependent encode/decode > macros. Note that since fprobe depends on CONFIG_HAVE_FUNCTION_GRAPH_FREGS, > currently only arm64, loongarch, riscv, s390 and x86 are supported. > > Signed-off-by: Masami Hiramatsu (Google) > --- > arch/arm64/include/asm/Kbuild | 1 + > arch/loongarch/include/asm/fprobe.h | 12 +++++++++ > arch/riscv/include/asm/Kbuild | 1 + > arch/s390/include/asm/fprobe.h | 10 ++++++++ Acked-by: Heiko Carstens # s390