Differential D29455 Diff 86501 sys/amd64/include/param.h

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sys/amd64/include/param.h

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	/*			/*
	* I/O permission bitmap has a bit for each I/O port plus an additional			* I/O permission bitmap has a bit for each I/O port plus an additional
	* byte at the end with all bits set. See section "I/O Permission Bit Map"			* byte at the end with all bits set. See section "I/O Permission Bit Map"
	* in the Intel SDM for more details.			* in the Intel SDM for more details.
	*/			*/
	#define IOPERM_BITMAP_SIZE (IOPAGES * PAGE_SIZE + 1)			#define IOPERM_BITMAP_SIZE (IOPAGES * PAGE_SIZE + 1)

	#ifndef KSTACK_PAGES			#ifndef KSTACK_PAGES
				#ifdef KASAN
				#define KSTACK_PAGES 6
				andrewUnsubmitted Not Done Inline Actions Why do we need more pages for `KASAN`? andrew: Why do we need more pages for `KASAN`?
				markjAuthorUnsubmitted Done Inline Actions Some of the ASAN options seem to increase stack usage rather substantially. I was able to trigger a double fault with ZFS due to a stack overflow with 4 kstack pages. markj: Some of the ASAN options seem to increase stack usage rather substantially. I was able to…
				#else
	#define KSTACK_PAGES 4 /* pages of kstack (with pcb) */			#define KSTACK_PAGES 4 /* pages of kstack (with pcb) */
				#endif
	#endif			#endif
	#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */			#define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */

	/*			/*
	* Mach derived conversion macros			* Mach derived conversion macros
	*/			*/
	#define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(PAGE_MASK))			#define round_page(x) ((((unsigned long)(x)) + PAGE_MASK) & ~(PAGE_MASK))
	#define trunc_page(x) ((unsigned long)(x) & ~(PAGE_MASK))			#define trunc_page(x) ((unsigned long)(x) & ~(PAGE_MASK))
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