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Mercier" Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, linuxppc-dev@lists.ozlabs.org, mripard@kernel.org, sumit.semwal@linaro.org, lkp@intel.com, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org, agordeev@linux.ibm.com, gerald.schaefer@linux.ibm.com, linux-s390@vger.kernel.org, Dan Williams , Tom Lendacky , x86@kernel.org Subject: Re: [PATCH] powerpc: Export set_memory_encrypted and set_memory_decrypted Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260522225853.878411-1-tjmercier@google.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 482BCA0002 X-Stat-Signature: cuxrh5mq6cx9zrnfkoh5forsg1ekyt9f X-HE-Tag: 1779690099-587055 X-HE-Meta: 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 3eUlXwYZ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, May 22, 2026 at 03:58:53PM -0700, T.J. Mercier wrote: > After commit fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a > module") the system dma-buf heaps can be built as a module. The > system_cc_shared heap uses set_memory_encrypted and set_memory_decrypted > but those functions are not exported on powerpc. This can result in a > build error like: I'd much rather revert the above commit. Yes, x86 has exported these since 2017, but that's a really bad idea, and we should fix it instead of spreading the export. Setting memory decrypted is a dangerous operations and should only be available to core code. We should have various allocators for decrypted code, but not export the functionality to random code.